/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.apache.hop.metadata.serializer.xml;

import java.lang.reflect.Field;
import java.util.function.Function;
import org.apache.hop.core.Const;
import org.apache.hop.metadata.api.HopMetadataProperty;

public class MetadataPropertyKeyFunction implements Function<Field, String> {
  @Override
  public String apply(Field field) {
    HopMetadataProperty annotation = field.getAnnotation(HopMetadataProperty.class);
    if (annotation == null) {
      return null;
    }
    return Const.NVL(annotation.groupKey(), Const.NVL(annotation.key(), field.getName()));
  }
}
